Gear shaping machining device

The invention belongs to the technical field of gear machining, and particularly relates to a gear shaping machining device which comprises a positioning assembly, a rotating mechanism, a jacking mechanism and a gear shaping cutter, the positioning assembly is used for placing and positioning a gear blank, and the jacking mechanism is used for driving the positioning assembly and the gear blank to move up and down, so that the upper end face of the gear blank abuts against the rotating mechanism; the rotating mechanism is used for driving the gear blank to rotate; the positioning assembly comprises a supporting plate, a plurality of inner supporting rods and a plurality of outer supporting rods, the inner supporting rods are arranged around the rotating center line, the center lines of the outer supporting rods and the inner supporting rods are collinear, the length of each inner supporting rod and the length of each outer supporting rod can be adjusted, when the gear blank is placed on the supporting plate,